c:\test>p1
Name "Data::Dump::MAX_WIDTH" used only once: possible typo at C:\Perl64\bin\p1.p
[0] Perl> system qq[ tasklist /fi "pid eq $$"];;

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
perl.exe                      5600 Console                    1      9,972 K
[0] Perl> $big = 'x' x 10e6;;
[0] Perl> system qq[ tasklist /fi "pid eq $$"];;

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
perl.exe                      5600 Console                    1     19,764 K
[0] Perl> undef $big;;
[0] Perl> system qq[ tasklist /fi "pid eq $$"];;

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
perl.exe                      5600 Console                    1      9,976 K